Go Back  Bike Forums > Bike Forums > Road Cycling
Reload this Page >

Identifying frame size with eyeball

Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

Identifying frame size with eyeball

Old 02-27-01, 10:13 PM
  #1  
watch
Newbie
Thread Starter
 
Join Date: Feb 2001
Location: Sacramento, CA
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I thought I could tell frame sizes by just
eyeballing the distance between the top tube
and the downtube where they meet the fork crown
or steering stem. But I've been looking at
photos of bikes on ebay that kind of surprise
me after reading their owner's descriptions. What
they say the frame is and what it looks like
at the fork crown don't jibe. Sometimes it
is higher, sometimes lower. Is my eyeball
method not reliable or are the sellers
confused? Thanks.

slo
watch is offline  
Old 03-01-01, 08:46 AM
  #2  
John E
feros ferio
 
John E's Avatar
 
Join Date: Jul 2000
Location: www.ci.encinitas.ca.us
Posts: 19,407

Bikes: 1959 & 1960 Capo; 1982 Bianchi; 1988 Schwinn KOM-10;

Mentioned: 29 Post(s)
Tagged: 0 Thread(s)
Quoted: 698 Post(s)
Liked 21 Times in 21 Posts
1) Camera perspective is tricky. If the bike is shot from the front, the head tube will look taller than in real life.
2) Bottom bracket heights vary. The higher the bottom bracket is off the ground, the longer the head tube will be for a given frame size.
3) Europeans specify center-to-center frame size, whereas Americans tend to use center-to-top. With standard tubes, this is about a 1.5cm difference. With oversize tubes, the disparity can be 2 or 2.5cm.
John E is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
willydstyle
Bicycle Mechanics
3
11-13-17 06:46 AM
stringmaster
Bicycle Mechanics
2
04-29-16 06:50 AM
Banzai
General Cycling Discussion
1
04-27-16 01:04 PM
Michael Angelo
Classic & Vintage
39
11-21-12 10:08 AM
Dr.Deltron
Bicycle Mechanics
1
12-03-06 06:10 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.